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UNT BIOL 3800 - Chapter 10 Review
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BIOL 3800 1st Edition Lecture 17 Outline of Current Lecture I. Review Question on Chapter 10 Before TestA. Myofibrils/FilamentsB. Agonist/AntagonistC. Red Muscle Contain Hemoglobin?D. Cross-Bridge Formation and Thickening of MuscleE. Where are the Nuclei?F. Actin Myosin Scattering Dark/Light BandG. TroponinCurrent LectureChapter 10 ReviewI. Review Question on Chapter 10 Before TestA. Myofibrils/ filaments1. Don’t get confused between myofibrils and the filaments if you do think filaments are the thinnest ones. The filaments are the actin and myosin inside. B. Agonist/Antagonist1. It’s outside factors that pull the muscle back to where it is that’s why we have agonists. 2. Without the agonistic muscle gravity may pull your muscle down but if you don’t have gravity then agonist will do it for you. 3. There is no way to push the muscle it is only in one direction. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.C. Red Muscles contain Hemoglobin?1. Red muscles do not contain hemoglobin but myoglobin don’t get that confused. 2. Not hemoglobin but related to hemoglobin. D. Cross-Bridge formation and Thickening of Muscle1. The cross-bridge formation is not necessarily why we see thickening of muscle when we contract it. 2. The cross-bridge formation just makes contact then we have the elastic relaxation of that myosin head that’s the present concept but what happens is simply that things get bunched up and you feel the thickening of it so it’s the result of many attachments and detachments it’s not so much the cross-bridge formation by itself. E. Where are the Nuclei?1. There are not multiple nuclei in the sarcomere. 2. There are multiple nuclei that are located outside the myofibrils that sarcomere is the internal structure of the myofibril nuclei are outside. 3. The nuclei are not inside the myofibrils they are outside. Then since Dr. Gross doesn’t know how they coordinate their activity we will not be going over that. F. Actin Myosin Scattering Dark/Light band1. Are there fewer scattering of electrons where there is actin? 2. This question deals with scattering of electrons meaning the more you scatter the darker it is and it depends on the density of the protein. 3. The staining material that you use attaches itself to proteins. 4. It’s not that specific so the more protein there is the darker that area becomes and the reason why one band is dark is because you have actin filaments and myosin filaments overlapping lots of protein there, lots of scattering. G. Troponin1. Question about troponin once the calcium is binding on to it and it turns to tropomyosin how does the head attach to actin? 2. The myosin head normally they are so close together that there is always thermal motion that the myosin head bounces against the actin but the active site the special site is covered partially by the tropomyosin and the troponin tends to pull the tropomyosin sideways. 3. So what happens is once the regulatory proteins have rotated out of the way you findthe active site once you have that active site it triggers that elastic relaxation without hydrolysis of ATP.4. You need ATP, the question becomes what happens and the easiest way to look at it isto say okay ATP is there, there’s ATP hydrolysis, there’s a considerable amount of force release or energy release and it blows off the myosin head from the actin and also energizes the head if you do that in one step that’s okay. 5. Sliding filament theory its fact that the filaments slide past each other. The theory part comes in the picture because the force generation is not completely pinned


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